Intact Stratigraphy Traversing the Phyllosilicate to Sulfate Eras at the Syrtis-Isidis Contact, Mars Intact Stratigraphy Traversing the Phyllosilicate to Sulfate Eras at the Syrtis-Isidis Contact, Mars John Mustard, Bethany Ehlmann, J. R. Skok, Dave Des Marais, Nicolas Mangold, and Francois Poulet 1 NOTE ADDED BY JPL WEBMASTER: This content has not been approved or adopted by, NASA, JPL, or the California Institute of Technology. This document is being made available for information purposes only, and any views and opinions expressed herein do not necessarily state or reflect those of NASA, JPL, or the California Institute of Technology